Which of the following is not an isotope of hydrogen?

Correct option is C

The correct answer is (c) Atrium.

Explanation:
Hydrogen has three main isotopes: Protium (Hydrogen-1), Deuterium (Hydrogen-2), and Tritium (Hydrogen-3). All these isotopes differ in the number of neutrons in their nuclei. Atrium, however, is not an isotope of hydrogen and does not exist in the context of hydrogen isotopes.

Information Booster:

• Protium is the most common isotope of hydrogen, consisting of one proton and one electron, with no neutrons.
• Deuterium has one proton, one neutron, and one electron, and is commonly used in scientific research and nuclear reactors.
• Tritium is a radioactive isotope of hydrogen, with one proton, two neutrons, and one electron.
• Isotopes of hydrogen share the same chemical properties but differ in their atomic mass and nuclear properties.
• Tritium is used in nuclear fusion and as a tracer in biological studies.
• Deuterium is found in naturally occurring water as "heavy water" (D₂O), used in nuclear reactors.

Additional Knowledge:

• Protium: The most abundant isotope of hydrogen, with an atomic number of 1 and no neutrons.
• Deuterium: Known as heavy hydrogen, with an atomic number of 1 and one neutron. It is stable and occurs naturally.
• Tritium: A radioactive isotope with one proton and two neutrons. It decays over time, emitting beta radiation.